The LHCb muon control system the DAQ domain

The LHCb Muon system consists of 122000 front-end channels, distributed on about 8000 front-end boards (on detector). 152 off detector boards (each containing 192 channels) gather information from front-end and send it to the DAQ and trigger systems. The Muon system is highly configurable and is conceived to allow a deep control of the behavior of the whole system during data taking. This results in a large number of configuration and status registers to be handled. The Muon control system, part of the LHCb experiment control system, is based on a PVSS II framework and is managed by a hierarchical finite state machine. We illustrate the control system architecture and the characteristics of its components, control units and device units. We also illustrate system performance in data communication, between the OPC servers and system electronics, obtained through a suitable design of dedicated firmware.